Hot-air blast-stove.



' No. 782,334. f PATBNTED PEB. 14, 1905.

- C. M.`GUNN an W. n. MULLOY.

. HOT AIR BLAST S'IOVE.`

APPLIUATION FILED gBPT. s. 190s.

2 SHEETS-SHEET lf.

f iz;

PATBNTBD FEB. 14,'1905.

c. M. GUNN & W. D. MULLOY.

HOT AIR BLAST STOVE. APrLIoATIoN FILED SEPT. a. 1903.

2 SHEETS-SHEET 2.

||H 'I Il l il l M mw QMMMM. 7

UNITED STATES` Patented February 14, 1905.

PATENT OFFICE.

CHARLES M. GUNN, OF SAUSALITO, AND WILLIAM D. MULLOY, OF CANYON, CALIFORNIA, ASSIGNORS TO UNION IRON WORKS, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION.

HOT-AIR BLAST-STOVE- SPECIFICATION forming part of Letters Patent No. 782,334, dated February 14, 1905. Applica@ auf september' a, 190'3. Striano. 172,231.

To ally whom, it may concern.'

Be it known that we, CHARLES M. GUNN, residing at Sausalito, Marion county, and WIL- LIAM I). MULLOY, residing at Canyon, Eldorado county, State ot'California, citizens of the United States, have invented certain new and useful Improvements in Hot-Air Blast- Stoves; and we do hereby declare the following to be a t'ull, clear, and exact description ot' the same.

The present invention relates to certain improvements in connection with blast-stoves used for supplying heated air to smelting-furnaces, the'same consisting in providing means whereby the air tubes or pipes are so connected as to distribute the strains of contraction and expansion uniformly throughout the series thereof, and in the connection of the end tubes oi' each series with end boxes or compartments Jfor receiving the cool air and' delivering same to the feed-tube of each series and the hot air from the discharge-tubes and delivering same to the supply-pipe for the heated air. f

To comprehend the invention, reference should be had. to the accompanying sheets of drawings, wherein- Figure 1 is a longitudinal sectional viewof the stove in side elevation, disclosing the manner of connecting or uniting the air-tubes to uniformly distribute the strains of expansion and contraction of the tubes, also the connection between the end tubes and the air-distributing boxes or compartments arranged at each end of the tubes. Fig. 2 is a top plan view of the stove, partly broken away, saidv View disclosing the arrangement of the tubesy within the stove; and Fig. 3 is a cross-sectional end view in elevation, illustrating the manner of suspending the air-tubes from the longitudinal roof-beams of the stove.

The numeral 1 is used to indicate the fire-box of the stove 2, and 3 the heating-chamber communicating with the said fire-box. From the said chamber leads the outlet-flue 4 for the waste products of combustion, which Hue communicates with the stack. (Not shown.) Ihese parts are of theusual construction, and hence require no specific description herein.

Within the combustion-chamber are arranged the air-tubes 5 6 7 8 9 10 11 12. Each stove unit, there being four disclosed by Figs. 2 and 3 ot' the drawings, consists of a corresponding series ot' said tubes, the irst tube,

or tube 5, of each series connecting with an' air-distributing compartment 13, which is attached or united tothe air-supply pipe 14, located outside of the rear wall of the stove by Vmeans of theconnection 15,'which extends in turn is attached to the discharge-pipe 18 (which conveys the heated air to any desired point) by means of the connection 19. This connection extends through an opening 20,

` formed in the front wall ot' the heating-chamber. The compartments 13 and 17 are arranged inside of the heating-chamber 3 and at each end thereof, as shown in Figs. 1 and 2 of the drawings. rlhe air-tubes at each end are formed with abutting collars or circular anges 21, which are united in the usual manner. The upper end flanges 22 .of Athe tubes 5 and 12 connect withV anges 23 of the extensions 211 241', depending', respectively, from the distributing-compartments 13 and'17 Each tube is formed with what shall hereinafter be termed head-blocks 25, which blocks are united to each other by means4 of bolts 25. The upper head-blocks of the end tubes are united, respectively, to the compartments 13 and 17, FigQl of the drawings. By preference the intermediate tubes are united at their upper and lower end by means of these headblocks. As thus fastened a solid connection is made between the tubes throughout the length of each series. Hence the strains of ex- -pansion and contraction of any one tube is distributed uniformly throughout the entire series of tubes. This is due to the fact that a rigid connection is made between each of the said tubes of the series. Inasmuch as the contraction and expansion takes place mainly at the top otl the tubes, it is essential that a rigid or solid connection between the tubes be made at their upper ends, which connection at the lower end of the tubes, if so desired, may be omitted. Each series of tubes is suspended from a longitudinal beam 26, arranged above the stove-roof 26 by means of the straps 27. These straps are pivoted to the tubes and united at their upper end by means of the pin 27', which pin rests upon the upper edge of the beam 26. Beingthus suspended, the entire series of rigidly-connected tubes may shift or swing longitudinally with the contraction and expansion of either tube, as the strain incident thereto is evenly distributed.

'Ihe air to be heated is delivered into the distributing-compartment or distributer 13 from the supply-pipe 14 and discharged into the tubes 5, connected therewith. Inasmuch as the distributer or compartment 13 is located 'within the heating-chamber 3, the ternperature of the air is raised the moment it enters the said compartment. As the air circulates throughout the length of the series of tubes it is highly heated and finally discharged into the receiver or receiving-compartment 17 for delivery into the discharge-pipe 18.

One series of tubes constitutes a single unit,

the stove illustrated comprising four units.

The number of units designates the capacity of the stove. These units are not connected other than by their end connections with the compartments 13 and 17.

The essential feature of .the present invention resides in the introduction of means in each unit of tubes for compensating for the contraction and expansion of the tubes by distributing the same uniformly between all the tubes of the series, which means in the present instance resides in the forming of a solid or rigid connection between the tubes throughout the length of each series.

Having thus described the invention, what is claimed as new, and desired to be protected by Letters Patent,l is- 1. In a hot-air blast-stove, the combination with the heating-chamber, of a series of airciroulating tubes suspended therein, comprising vertically-arranged communicating coils, and solid connections between the tubes at the upper and lower ends, comprising heads extending over and connected to the communicating ends of the tubes, said heads having inwardly-turned anges between adjacent eoils and bolts securing adjacent flanges.

2. In a hot-air blast-stove, the combination .with the heating-chamber, of a series of aircirculating tu bes suspended therein, comprising vertically-arranged communicating coils, and solid connections between the tubes at their upper and lower ends, comprising heads extending over and connected to the communicating ends of the tubes, said heads having connected. inwardlyturned 'langes between adjacent coils.

3. In a hot-air blast-stove, the combination with the heating-chamber, of a seriesof aircirculating tubes suspended therein, comprising vertically-arranged communicating coils, and solid connections between the tubes at their upper and lower ends, comprising heads extending over and connected to the communicating ends of the tubes, said heads being connected between adjacent coils.

In witness whereof we have hereunto set our hands.

CHARLES M. GUNN. WILLIAM D. MULLOY.v

lWitnesses:

WALTER F. VANE, D. B. RICHARDS. 

